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#analyse du jeu de données MP graminées
#en R cette fois

install.packages("dplyr")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/rchaz/AppData/Local/R/win-library/4.3’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.3/dplyr_1.1.2.zip'
Content type 'application/zip' length 1551420 bytes (1.5 MB)
downloaded 1.5 MB
package ‘dplyr’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\rchaz\AppData\Local\Temp\RtmpAHim9b\downloaded_packages
library(rlang)
library(dplyr)

Attaching package: ‘dplyr’

The following object is masked from ‘package:signal’:

    filter

The following objects are masked from ‘package:stats’:

    filter, lag

The following objects are masked from ‘package:base’:

    intersect, setdiff, setequal, union
#installation des librairies
install.packages("readxl")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/rchaz/AppData/Local/R/win-library/4.3’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.3/readxl_1.4.3.zip'
Content type 'application/zip' length 1194912 bytes (1.1 MB)
downloaded 1.1 MB
package ‘readxl’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\rchaz\AppData\Local\Temp\RtmpAHim9b\downloaded_packages
install.packages("ggplot2")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/rchaz/AppData/Local/R/win-library/4.3’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.3/ggplot2_3.4.3.zip'
Content type 'application/zip' length 3329305 bytes (3.2 MB)
downloaded 3.2 MB
package ‘ggplot2’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\rchaz\AppData\Local\Temp\RtmpAHim9b\downloaded_packages
install.packages("caret")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/rchaz/AppData/Local/R/win-library/4.3’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.3/caret_6.0-94.zip'
Content type 'application/zip' length 3576720 bytes (3.4 MB)
downloaded 3.4 MB
package ‘caret’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\rchaz\AppData\Local\Temp\RtmpAHim9b\downloaded_packages
install.packages("MASS") 
Error in install.packages : Updating loaded packages
install.packages("reshape2") 
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/rchaz/AppData/Local/R/win-library/4.3’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.3/reshape2_1.4.4.zip'
Content type 'application/zip' length 454253 bytes (443 KB)
downloaded 443 KB
package ‘reshape2’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\rchaz\AppData\Local\Temp\RtmpAHim9b\downloaded_packages
install.packages("reshape") 
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/rchaz/AppData/Local/R/win-library/4.3’
(as ‘lib’ is unspecified)
trying URL 'https://cran.rstudio.com/bin/windows/contrib/4.3/reshape_0.8.9.zip'
Content type 'application/zip' length 170892 bytes (166 KB)
downloaded 166 KB
package ‘reshape’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\rchaz\AppData\Local\Temp\RtmpAHim9b\downloaded_packages
install.packages("signal") 
Error in install.packages : Updating loaded packages
#Load required libraries
library(ggplot2)
library(readxl)
library(caret)
Loading required package: lattice

Attaching package: ‘caret’

The following object is masked from ‘package:pls’:

    R2
library(signal)
library(pls)

# Create an empty data frame
df <- data.frame()

# Read the Excel data
data <- read_excel('MPall2000600cm.xlsx')

# Display the first 50 rows of data
head(data, 50)
#49 échantillons... c'st tout ce que j'ai pu retrouver.
#et encore : il y a 10 lignines dedans. Vu qu'on se concentre sur les MP, ça réduit le br d'échantillons à 38...
#on ne peut pas faire une prédiction dans les règles avec si peu. Je ne sais pas si je pourrai même obtenir des performances satisfaisantes ave si peu.

#Ouliers attendus : 9F, FF1, FF3  (6, 7, 8)
# Analyze variable types
variable_types <- table(sapply(data, class))

# Plot pie chart for variable types
pie(variable_types, labels = names(variable_types), main = "Variable Types")

# Get the counts of variable types
variable_counts <- table(sapply(data, class))

# Print the counts of variable types
print(variable_counts)

character   numeric 
        1       737 
library(reshape2)
# Drop rows with indices 6, 7, and 8
data <- data[-c(6, 7, 8), ]

# Display the first 40 rows of data
head(data, 40)
# Drop row index 6
data <- data[-6, ]

# Select columns for X
X <- data[, 12:ncol(data)]

# Select columns for Y in PLS1
Y_pcoum <- data[, 10]
Y_SG <- data[, 7]
Y_syr <- data[, 8]
Y_gua <- data[, 9]
Y_oses <- data[, 2]
Y_LK <- data[, 6]

# Select columns for Y in PLS2
Y <- data[, c(2, 6, 7, 10)]
# Display the first 50 rows of X dataset
head(X, 50)
# Display the first few rows of Y_pcoum column
head(Y, 50)
# Create a heatmap to visualize missing values
install.packages("ggplot2")
Error in install.packages : Updating loaded packages
library(ggplot2)

missing_values <- is.na(data)
missing_values_melted <- melt(missing_values)

ggplot(data = missing_values_melted, aes(x = Var2, y = Var1, fill = value)) +
  geom_tile() +
  scale_fill_manual(values = c("TRUE" = "red", "FALSE" = "white")) +labs(title = "Missing Values Heatmap")

# Drop rows with indices 6, 7, and 8
#data <- data[-c(6, 7, 8), ]

# Display the first 40 rows of data
head(data, 40)
# Drop row index 6
#data <- data[-6, ]

# Select columns for X
X <- data[, 12:ncol(data)]

# Select columns for Y in PLS1
Y_pcoum <- data[, 10]
Y_SG <- data[, 7]
Y_syr <- data[, 8]
Y_gua <- data[, 9]
Y_oses <- data[, 2]
Y_LK <- data[, 6]

# Select columns for Y in PLS2
Y <- data[, c(2, 6, 7, 10)]
# Display the first 50 rows of X dataset
head(X, 50)
# Display the first few rows of Y_pcoum column
head(Y_pcoum, 50)
# Display the first few rows of Y dataset
head(Y)
#proChaine étape : le prétraitement des spectres


# Create a vector for wavelength values
wl <- seq(0, 727, 1)

# Plot the transposed data matrix
matplot(X, type = "l", xlab = "Wavelength", ylab = "Spectral Value", 
        col = 1:ncol(X), lty = 1)

dim(Y)
[1] 35  4
dim(X)
[1]  35 727
# Define the SNV normalization function
snv <- function(input_data) {
  output_data <- matrix(0, nrow = nrow(input_data), ncol = ncol(input_data))
  
  for (i in 1:nrow(input_data)) {
    output_data[i,] <- (input_data[i,] - mean(input_data[i,])) / sd(input_data[i,])
  }
  
  return(output_data)
}

# Convert X to a matrix
X <- as.matrix(X)

# Apply SNV normalization
Xsnv <- snv(X)

# Plot the normalized spectral values
matplot(t(Xsnv), type = "l", xlab = "Wavelength", ylab = "Normalized Spectral Value", 
        col = 1:ncol(Xsnv), lty = 1)

dim(Xsnv)
[1]  35 727
# Load the required library
install.packages("signal") 
Error in install.packages : Updating loaded packages
library(signal)

# Define Savitzky-Golay parameters
window_size <- 17
poly_order <- 2

# Transpose the matrix to work on columns
X_transposed <- t(X)

# Apply the Savitzky-Golay filter for second derivative to columns
X2_transposed <- apply(X_transposed, 2, function(col) {
  deriv_filter <- sgolayfilt(c(rep(0, 8), -2, rep(0, 8)), p = 2, n = 17)
  filtered_col <- convolve(col, deriv_filter, type = "filter")
  return(filtered_col)
})

# Transpose the result back to the original orientation
X2 <- t(X2_transposed)

# Plot the second derivative values
matplot(t(X2), type = "l", xlab = "Wavelength", ylab = "Second Derivative Value", 
        col = 1:ncol(X2), lty = 1)

dim(X2)
[1]  35 711
# Apply the Savitzky-Golay filter for second derivative
X2snv <- snv(X2)
dim(X2snv)
[1]  35 711
#tentons une PLS
library(pls)


# Initialize empty vectors to store results
R2_cal <- numeric()
R2_cv <- numeric()
RMSE_cal <- numeric()
RMSE_cv <- numeric()
Var_cal <- numeric()

Components <- 1:20

# Combine the predictor variables and the response variable into a single data frame
data_df <- data.frame(Y_pcoum = unlist(Y_pcoum), Xsnv)


# Calibration
PLS_pcoum <- plsr(Y_pcoum ~ ., ncomp = 7, data = data_df)
Ypred <- predict(PLS_pcoum, newdata = data_df)
  
# Extract the appropriate dimension of Ypred
Ypred_flat <- Ypred[, 1, ]
  
#reprenons nos calculs
R2 <- cor(Ypred_flat, data_df$Y_pcoum)^2
RMSE <- sqrt(mean((Ypred_flat - data_df$Y_pcoum)^2))
 
#résultats 
cat("Results for 7 components\n")
Results for 7 components
cat("R2:", R2, "\n")
R2: 0.5911774 0.6985943 0.854471 0.9495035 0.9688896 0.9771441 0.9819514 
cat("RMSE:", RMSE, "\n\n")
RMSE: 3.036214 
# Cross-validation
Y_cv <- predict(PLS_pcoum, newdata = data.frame(Xsnv), validation = "CV")

# Extract the appropriate dimension of Ypred
Y_cv_flat <- Y_cv[, 1, ]
  
# Calculate scores
R2_cv2 <- cor(Y_cv_flat, data_df$Y_pcoum)^2
RMSE_cv <- sqrt(mean((Y_cv_flat - data_df$Y_pcoum)^2))
  
# Print the results
cat("Results for 7 components\n")
Results for 7 components
cat("R2_cv2:", R2_cv2, "\n")
R2_cv2: 0.5911774 0.6985943 0.854471 0.9495035 0.9688896 0.9771441 0.9819514 
cat("RMSE_cv:", RMSE_cv, "\n\n")
RMSE_cv: 3.036214 

#tentons une autre aporoche pour la cross validation.

# Calibration
PLS_pcoum <- plsr(Y_pcoum ~ ., ncomp = 7, data = data_df)
Ypred <- predict(PLS_pcoum, newdata = data_df)

# Extract the appropriate dimension of Ypred
Ypred_flat <- Ypred[, 1, ]

# Perform manual cross-validation
set.seed(123)  # For reproducibility
num_samples <- nrow(data_df)
num_folds <- 10
fold_size <- num_samples / num_folds

# Initialize vectors to store cross-validation results
R2_cv <- numeric()
RMSE_cv <- numeric()

for (fold in 1:num_folds) {
  # Divide data into training and validation sets
  val_start <- ((fold - 1) * fold_size) + 1
  val_end <- fold * fold_size
  val_indices <- val_start:val_end
  train_indices <- setdiff(1:num_samples, val_indices)
  
  # Fit PLS model on training data
  PLS_pcoum_fold <- plsr(Y_pcoum ~ ., ncomp = 7, data = data_df[train_indices, ])
  
  # Predict on validation data
  Y_cv_fold <- predict(PLS_pcoum_fold, newdata = data_df[val_indices, ])
  
  # Extract the appropriate dimension of Y_cv_fold
  Y_cv_flat <- Y_cv_fold[, 1, ]
  
  # Calculate scores for this fold
  R2_cv_fold <- cor(Y_cv_flat, data_df$Y_pcoum[val_indices])^2
  RMSE_cv_fold <- sqrt(mean((Y_cv_flat - data_df$Y_pcoum[val_indices])^2))
  
  # Store the results for this fold
  R2_cv <- c(R2_cv, R2_cv_fold)
  RMSE_cv <- c(RMSE_cv, RMSE_cv_fold)
}


# Calculate average R2 for cross-validation
average_R2_cv <- mean(R2_cv)

# Calculate average RMSE for cross-validation
average_RMSE_cv <- mean(RMSE_cv)

# Print the cross-validation results
cat("Cross-validation results:\n")
Cross-validation results:
cat("R2_cv:", average_R2_cv, "\n")
R2_cv: 0.7519379 
cat("RMSE_cv:", average_RMSE_cv, "\n")
RMSE_cv: 2.781517 
#j'arrete le script ici. Mon objectif est de monter que je peux traduire un script python en R.
#Le reste du script étant de la PLS sur d'autres paramètres et avec les spectres dérivés, c'est assez répétitif.
#
---
title: "R Notebook"
output: html_notebook
---

This is an [R Markdown](http://rmarkdown.rstudio.com) Notebook. When you execute code within the notebook, the results appear beneath the code. 

Try executing this chunk by clicking the *Run* button within the chunk or by placing your cursor inside it and pressing *Ctrl+Shift+Enter*. 
```{r}
getwd()
```


Add a new chunk by clicking the *Insert Chunk* button on the toolbar or by pressing *Ctrl+Alt+I*.

When you save the notebook, an HTML file containing the code and output will be saved alongside it (click the *Preview* button or press *Ctrl+Shift+K* to preview the HTML file).

The preview shows you a rendered HTML copy of the contents of the editor. Consequently, unlike *Knit*, *Preview* does not run any R code chunks. Instead, the output of the chunk when it was last run in the editor is displayed.
```{r}
#analyse du jeu de données MP graminées
#en R cette fois

install.packages("dplyr")
library(rlang)
library(dplyr)

#installation des librairies
install.packages("readxl")
install.packages("ggplot2")
install.packages("caret")
install.packages("MASS") 
install.packages("reshape2") 
install.packages("reshape") 
install.packages("signal") 

#Load required libraries
library(ggplot2)
library(readxl)
library(caret)
library(signal)
library(pls)

# Create an empty data frame
df <- data.frame()

# Read the Excel data
data <- read_excel('MPall2000600cm.xlsx')

# Display the first 50 rows of data
head(data, 50)
```


```{r}
#49 échantillons... c'st tout ce que j'ai pu retrouver.
#et encore : il y a 10 lignines dedans. Vu qu'on se concentre sur les MP, ça réduit le br d'échantillons à 38...
#on ne peut pas faire une prédiction dans les règles avec si peu. Je ne sais pas si je pourrai même obtenir des performances satisfaisantes ave si peu.

#Ouliers attendus : 9F, FF1, FF3  (6, 7, 8)

```
```{r}
# Analyze variable types
variable_types <- table(sapply(data, class))

# Plot pie chart for variable types
pie(variable_types, labels = names(variable_types), main = "Variable Types")
```

```{r}
# Get the counts of variable types
variable_counts <- table(sapply(data, class))

# Print the counts of variable types
print(variable_counts)
```
```{r}
library(reshape2)
```


```{r}
# Drop rows with indices 6, 7, and 8
data <- data[-c(6, 7, 8), ]

# Display the first 40 rows of data
head(data, 40)
```

```{r}
# Drop row index 6
data <- data[-6, ]

# Select columns for X
X <- data[, 12:ncol(data)]

# Select columns for Y in PLS1
Y_pcoum <- data[, 10]
Y_SG <- data[, 7]
Y_syr <- data[, 8]
Y_gua <- data[, 9]
Y_oses <- data[, 2]
Y_LK <- data[, 6]

# Select columns for Y in PLS2
Y <- data[, c(2, 6, 7, 10)]

```


```{r}
# Display the first 50 rows of X dataset
head(X, 50)
```


```{r}
# Display the first few rows of Y_pcoum column
head(Y, 50)
```





```{r}
# Create a heatmap to visualize missing values
install.packages("ggplot2")
library(ggplot2)

missing_values <- is.na(data)
missing_values_melted <- melt(missing_values)

ggplot(data = missing_values_melted, aes(x = Var2, y = Var1, fill = value)) +
  geom_tile() +
  scale_fill_manual(values = c("TRUE" = "red", "FALSE" = "white")) +labs(title = "Missing Values Heatmap")
```


```{r}
# Drop rows with indices 6, 7, and 8
#data <- data[-c(6, 7, 8), ]

# Display the first 40 rows of data
head(data, 40)
```


```{r}
# Drop row index 6
#data <- data[-6, ]

# Select columns for X
X <- data[, 12:ncol(data)]

# Select columns for Y in PLS1
Y_pcoum <- data[, 10]
Y_SG <- data[, 7]
Y_syr <- data[, 8]
Y_gua <- data[, 9]
Y_oses <- data[, 2]
Y_LK <- data[, 6]

# Select columns for Y in PLS2
Y <- data[, c(2, 6, 7, 10)]
```


```{r}
# Display the first 50 rows of X dataset
head(X, 50)
```


```{r}
# Display the first few rows of Y_pcoum column
head(Y_pcoum, 50)
```


```{r}
# Display the first few rows of Y dataset
head(Y)
```


```{r}
#proChaine étape : le prétraitement des spectres


# Create a vector for wavelength values
wl <- seq(0, 727, 1)

# Plot the transposed data matrix
matplot(X, type = "l", xlab = "Wavelength", ylab = "Spectral Value", 
        col = 1:ncol(X), lty = 1)
```


```{r}
dim(Y)
```


```{r}
dim(X)
```


```{r}
# Define the SNV normalization function
snv <- function(input_data) {
  output_data <- matrix(0, nrow = nrow(input_data), ncol = ncol(input_data))
  
  for (i in 1:nrow(input_data)) {
    output_data[i,] <- (input_data[i,] - mean(input_data[i,])) / sd(input_data[i,])
  }
  
  return(output_data)
}

# Convert X to a matrix
X <- as.matrix(X)

# Apply SNV normalization
Xsnv <- snv(X)

# Plot the normalized spectral values
matplot(t(Xsnv), type = "l", xlab = "Wavelength", ylab = "Normalized Spectral Value", 
        col = 1:ncol(Xsnv), lty = 1)

```
```{r}
dim(Xsnv)
```


```{r}
# Load the required library
install.packages("signal") 
library(signal)

# Define Savitzky-Golay parameters
window_size <- 17
poly_order <- 2

# Transpose the matrix to work on columns
X_transposed <- t(X)

# Apply the Savitzky-Golay filter for second derivative to columns
X2_transposed <- apply(X_transposed, 2, function(col) {
  deriv_filter <- sgolayfilt(c(rep(0, 8), -2, rep(0, 8)), p = 2, n = 17)
  filtered_col <- convolve(col, deriv_filter, type = "filter")
  return(filtered_col)
})

# Transpose the result back to the original orientation
X2 <- t(X2_transposed)

# Plot the second derivative values
matplot(t(X2), type = "l", xlab = "Wavelength", ylab = "Second Derivative Value", 
        col = 1:ncol(X2), lty = 1)
```
```{r}
dim(X2)
```


```{r}
# Apply the Savitzky-Golay filter for second derivative
X2snv <- snv(X2)
```


```{r}
dim(X2snv)
```


```{r}
#tentons une PLS
library(pls)


# Initialize empty vectors to store results
R2_cal <- numeric()
R2_cv <- numeric()
RMSE_cal <- numeric()
RMSE_cv <- numeric()
Var_cal <- numeric()

Components <- 1:20

# Combine the predictor variables and the response variable into a single data frame
data_df <- data.frame(Y_pcoum = unlist(Y_pcoum), Xsnv)


# Calibration
PLS_pcoum <- plsr(Y_pcoum ~ ., ncomp = 7, data = data_df)
Ypred <- predict(PLS_pcoum, newdata = data_df)
  
# Extract the appropriate dimension of Ypred
Ypred_flat <- Ypred[, 1, ]
  
#reprenons nos calculs
R2 <- cor(Ypred_flat, data_df$Y_pcoum)^2
RMSE <- sqrt(mean((Ypred_flat - data_df$Y_pcoum)^2))
 
#résultats 
cat("Results for 7 components\n")
cat("R2:", R2, "\n")
cat("RMSE:", RMSE, "\n\n")


# Cross-validation
Y_cv <- predict(PLS_pcoum, newdata = data.frame(Xsnv), validation = "CV")

# Extract the appropriate dimension of Ypred
Y_cv_flat <- Y_cv[, 1, ]
  
# Calculate scores
R2_cv2 <- cor(Y_cv_flat, data_df$Y_pcoum)^2
RMSE_cv <- sqrt(mean((Y_cv_flat - data_df$Y_pcoum)^2))
  
# Print the results
cat("Results for 7 components\n")
cat("R2_cv2:", R2_cv2, "\n")
cat("RMSE_cv:", RMSE_cv, "\n\n")
```


```{r}

#tentons une autre approche pour la cross validation : 10 segments.

# Calibration
PLS_pcoum <- plsr(Y_pcoum ~ ., ncomp = 7, data = data_df)
Ypred <- predict(PLS_pcoum, newdata = data_df)

# Extract the appropriate dimension of Ypred
Ypred_flat <- Ypred[, 1, ]

# Perform manual cross-validation
set.seed(123)  # For reproducibility
num_samples <- nrow(data_df)
num_folds <- 10
fold_size <- num_samples / num_folds

# Initialize vectors to store cross-validation results
R2_cv <- numeric()
RMSE_cv <- numeric()

for (fold in 1:num_folds) {
  # Divide data into training and validation sets
  val_start <- ((fold - 1) * fold_size) + 1
  val_end <- fold * fold_size
  val_indices <- val_start:val_end
  train_indices <- setdiff(1:num_samples, val_indices)
  
  # Fit PLS model on training data
  PLS_pcoum_fold <- plsr(Y_pcoum ~ ., ncomp = 7, data = data_df[train_indices, ])
  
  # Predict on validation data
  Y_cv_fold <- predict(PLS_pcoum_fold, newdata = data_df[val_indices, ])
  
  # Extract the appropriate dimension of Y_cv_fold
  Y_cv_flat <- Y_cv_fold[, 1, ]
  
  # Calculate scores for this fold
  R2_cv_fold <- cor(Y_cv_flat, data_df$Y_pcoum[val_indices])^2
  RMSE_cv_fold <- sqrt(mean((Y_cv_flat - data_df$Y_pcoum[val_indices])^2))
  
  # Store the results for this fold
  R2_cv <- c(R2_cv, R2_cv_fold)
  RMSE_cv <- c(RMSE_cv, RMSE_cv_fold)
}


# Calculate average R2 for cross-validation
average_R2_cv <- mean(R2_cv)

# Calculate average RMSE for cross-validation
average_RMSE_cv <- mean(RMSE_cv)

# Print the cross-validation results
cat("Cross-validation results:\n")
cat("R2_cv:", average_R2_cv, "\n")
cat("RMSE_cv:", average_RMSE_cv, "\n")
```





```{r}
#j'arrete le script ici. Mon objectif est de monter que je peux traduire un script python en R.
#Le reste du script étant de la PLS sur d'autres paramètres et avec les spectres dérivés, c'est assez répétitif.
#
